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6910944bf0
The typedef creates an issue where the struct or the typedef may
appear in the output and cause the "perf data type profiling tests" to
fail. Let's remove the typedef to keep the test passing.
Fixes: 335047109d ("perf tests: Test annotate with data type profiling and C")
Signed-off-by: Ian Rogers <irogers@google.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
61 lines
1.4 KiB
C
61 lines
1.4 KiB
C
#include <stdlib.h>
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#include <signal.h>
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#include <unistd.h>
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#include <linux/compiler.h>
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#include "../tests.h"
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struct buf {
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char data1;
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char reserved[55];
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char data2;
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} __attribute__((aligned(64)));
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/* volatile to try to avoid the compiler seeing reserved as unused. */
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static volatile struct buf workload_datasym_buf1 = {
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/* to have this in the data section */
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.reserved[0] = 1,
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};
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static volatile sig_atomic_t done;
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static void sighandler(int sig __maybe_unused)
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{
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done = 1;
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}
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static int datasym(int argc, const char **argv)
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{
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int sec = 1;
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if (argc > 0)
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sec = atoi(argv[0]);
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signal(SIGINT, sighandler);
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signal(SIGALRM, sighandler);
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alarm(sec);
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while (!done) {
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workload_datasym_buf1.data1++;
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if (workload_datasym_buf1.data1 == 123) {
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/*
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* Add some 'noise' in the loop to work around errata
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* 1694299 on Arm N1.
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*
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* Bias exists in SPE sampling which can cause the load
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* and store instructions to be skipped entirely. This
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* comes and goes randomly depending on the offset the
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* linker places the datasym loop at in the Perf binary.
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* With an extra branch in the middle of the loop that
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* isn't always taken, the instruction stream is no
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* longer a continuous repeating pattern that interacts
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* badly with the bias.
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*/
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workload_datasym_buf1.data1++;
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}
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workload_datasym_buf1.data2 += workload_datasym_buf1.data1;
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}
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return 0;
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}
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DEFINE_WORKLOAD(datasym);
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